Flexible touch sensitive display device and control method thereof

ABSTRACT

A flexible display device including a flexible display unit; and a controller configured to receive a first touch input at a first position on the flexible display unit in a flat state, store, in a memory, first position information of the first touch input that is offset a first predetermined amount from the first position, receive a second touch input at the first position on the flexible display unit in a first bent state, and store, in the memory, second position information of the second touch input that is offset a second predetermined amount from the first position, wherein the first predetermined amount of offset is greater than the second predetermined amount of offset.

CROSS REFERENCE TO THE RELATED APPLICATIONS

This application is a continuation-in-part of co-pending applicationSer. No. 14/570,756, filed on Dec. 15, 2014, which is a continuation ofapplication Ser. No. 14/314,747 filed on Jun. 25, 2014, now U.S. Pat.No. 8,928,619, which claims the benefit of Korean Patent Application No.10-2014-0044700 filed on Apr. 15, 2014. The contents of all of theseapplications are hereby incorporated by reference as fully set forthherein in their entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The present specification relates to a flexible display device, and moreparticularly to a flexible display device, which functions to correctposition information regarding touch input, and a control methodthereof.

Discussion of the Related Art

A flexible display device may display the same resolution of image evenwhen folded or bent. Accordingly, a user may minimize the volume of theflexible display device and achieve convenience in carriage by rollingthe flexible display device. In addition, even in an unfolded or spreadstate thereof, the flexible display device may advantageously providethe user with a screen having one of various sizes and angles viabending thereof.

However, in the case of the flexible display device, upon detection ofuser touch input, there may occur a difference between a position theuser wishes to touch and a position where the touch input is actuallydetected according to a bending angle of the flexible display device.Therefore, the flexible display device may need to correct positioninformation regarding the detected touch input.

SUMMARY OF THE INVENTION

Accordingly, the present specification is directed to a flexible displaydevice and a control method thereof that substantially obviate one ormore problems due to limitations and disadvantages of the related art.

More particularly, an object of the present specification is to providea method for detecting touch input to a flexible display device andcorrecting position information regarding the detected touch input.

Additional advantages, objects, and features of the specification willbe set forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of thespecification. The objectives and other advantages of the specificationmay be realized and attained by the structure particularly pointed outin the written description and claims hereof as well as the appendeddrawings.

To achieve these objects and other advantages and in accordance with oneembodiment of the specification, as embodied and broadly describedherein, a flexible display device includes a flexible display unithaving a flat state and a bent state, a touch sensor unit configured tosense touch input, a bending sensor unit configured to sense a bendingangle of the flexible display unit, and a controller configured tocontrol the flexible display unit, the touch sensor unit, and thebending sensor unit, wherein the controller corrects positioninformation, regarding the touch input detected at a first position ofthe flexible display unit, to a second position when the flexibledisplay unit is in the flat state, wherein the controller correctsposition information, regarding the touch input detected at the firstposition, to a third position when the flexible display unit is in afirst bent state, and wherein a distance between the first position andthe third position is less than a distance between the first positionand the second position.

In accordance with another embodiment of the present specification, acontrol method of a flexible display device, includes sensing a state ofthe flexible display device, detecting touch input at a first positionof the flexible display device, correcting position information,regarding the touch input detected at the first position, to a secondposition when the flexible display device is in a flat state, andcorrecting position information, regarding the touch input detected atthe first position, to a third position when the flexible display deviceis in a first bent state, wherein a distance between the first positionand the third position is less than a distance between the firstposition and the second position.

It is to be understood that both the foregoing general description andthe following detailed description of the present specification areexemplary and explanatory and are intended to provide furtherexplanation of the specification as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the specification and are incorporated in andconstitute a part of this application, illustrate embodiment(s) of thespecification and together with the description serve to explain theprinciple of the specification. In the drawings:

FIG. 1 is a view showing first position correction with respect to atouch point of a flexible display device according to one embodiment ofthe present specification;

FIG. 2 is a view showing second position correction with respect to atouch point of the flexible display device in a flat state according toone embodiment of the present specification;

FIG. 3 is a view showing second position correction with respect to atouch point of the flexible display device in a first bent stateaccording to one embodiment of the present specification;

FIG. 4 is a view showing second position correction with respect to atouch point of the flexible display device in a second bent stateaccording to one embodiment of the present specification;

FIG. 5 is a view showing a method for correcting drag input to theflexible display device according to one embodiment of the presentspecification;

FIG. 6 is a view showing a method for determining a bent state of aflexible display device according to one embodiment of the presentspecification;

FIG. 7 is a view showing state setting on a per region basis of theflexible display device according to one embodiment of the presentspecification;

FIG. 8 is a block diagram of the flexible display device according toone embodiment of the present specification; and

FIG. 9 is a flowchart showing operation of the flexible display deviceaccording to one embodiment of the present specification.

FIG. 10 is a block diagram of the flexible display device according toone embodiment of the present specification; and

FIG. 11 is a flowchart showing operation of the flexible display deviceaccording to one embodiment of the present specification.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, various embodiments will be described in detail withreference to the attached drawings and illustrations thereof, but itshould be understood that the present specification is not restricted orlimited by the embodiments that will be described hereinafter.

Although the terms used in the following description are selected, asmuch as possible, from general terms that are widely used at presentwhile taking into consideration the functions obtained in accordancewith the present specification, these terms may be replaced by otherterms based on intensions of those skilled in the art, customs,emergence of new technologies, or the like. Also, in a particular case,terms that are arbitrarily selected by the applicant of the presentspecification may be used. In this case, the meanings of these terms maybe described in corresponding description parts of the specification.Accordingly, it should be noted that the terms used herein should beconstrued based on practical meanings thereof and the whole content ofthis specification, rather than being simply construed based on names ofthe terms.

In the following description, a flexible display device may mean adisplay device whose shape is changeable by a user. That is, examples ofthe flexible display device may include electronic paper, a foldabledisplay device, and a rollable display device. Although the flexibledisplay device will be described below by way of example, theembodiments of the present specification are not limited thereto.

FIG. 1 is a view showing first position correction with respect to atouch point of a flexible display device according to one embodiment ofthe present specification. The flexible display device may change aposition of a displayed object based on bending thereof. In addition,the flexible display device may change, based on the changed position ofthe object, a position where touch input of selecting the correspondingobject is detected.

In the upper of FIG. 1, the flexible display device 10 in a flat statemay display an image. The displayed image may include a plurality ofgraphical objects. The flexible display device 10 may display a firstobject 11, a second object 12, and a third object 13. When touch inputis detected at a position where a first sensing line 14 and the firstobject 11 cross each other, the flexible display device 10 may detectthe corresponding touch input as touch input of selecting the firstobject 11. Likewise, when touch input is detected at a position where asecond sensing line 15 and the second object 12 cross each other, theflexible display device 10 may detect the corresponding touch input astouch input of selecting the second object 12. In addition, when touchinput is detected at a position where a third sensing line 16 and thethird object 13 cross each other, the flexible display device 10 maydetect the corresponding touch input as touch input of selecting thethird object 13.

In the middle of FIG. 1, the flexible display device 10 may be bent. Theflexible display device 10 in a bent state may display the same image asthe image provided by the flexible display device 10 in the flat state.Despite that the flexible display device 10 displays the same image, auser may recognize different images in the flat state and the bent stateof the flexible display device 10. This is because the displayed imagemust be bent by the curvature of the flexible display device 10 uponbending of the flexible display device 10. Accordingly, when theflexible display device 10 is bent such that left and right sidesthereof are rolled inward as exemplarily shown in the middle of FIG. 1,a left-and-right length of the displayed image may be changed. That is,as the flexible display device 10 is bent, an angle between the eyes ofthe user and the flexible display device 10 is changed, which causes theuser to recognize an image having a reduced left-and-right lengthdespite that the same image is displayed. For example, in the middle ofFIG. 1, a distance between the first object 11 and the second object 12and a distance between the second object 12 and the third object 13 maybe reduced as compared to those in the upper of FIG. 1.

In a case in which distortion of the image occurs due to bending of theflexible display device 10, the flexible display device 10 maycompensate for the distortion of the image by changing a position of thedisplayed object. That is, as exemplarily shown in the lower of FIG. 1,the flexible display device 10 may move a display position of the firstobject 11 leftward and a display position of the third object 13rightward, thereby providing an image similar to that provided to theuser in the upper of FIG. 1.

As described above, in a case in which the position of the displayedobject is changed, the flexible display device 10 needs tosimultaneously change a detection position of touch input of selectingthe corresponding object. Otherwise the position of the displayed objectmay differ from the detection position of the touch input when the uservisually checks the object whose position is changed and selects thecorresponding object using the touch input. Accordingly, as exemplarilyshown in the lower of FIG. 1, the flexible display device 10 may detecttouch input of selecting the first object 11 by moving a position of thefirst sensing line 14 leftward or using another sensing line located atthe left side of the first sensing line 14. This is because the firstobject 11 is moved farther leftward than a displayed position thereof ina flat state of the flexible display device 10. In addition, theflexible display device 10 may not change a position of the secondsensing line 15 that is used to sense touch input to the second object12. When the second object 12 is located on a bending axis, a positionof the second object 12 recognized by the user is not changed.Accordingly, with regard to an object that is located on a bending axisor that is present within a predetermined distance from the bendingaxis, the flexible display device 10 may continuously keep a sensingline for the corresponding object at the same position in a flat stateand in a bent state thereof. In addition, the flexible display device 10may detect touch input of selecting the third object 13 by moving aposition of the third sensing line 16 rightward or using another sensingline located at the right side of the third sensing line 16. This isbecause the third object 13 is moved farther rightward than a displayedposition thereof in a flat state of the flexible display device 10.

As described above, the flexible display device 10 may change a positionof the displayed object based on whether or not the flexible displaydevice 10 is bent, and simultaneously may change a detection position oftouch input to the corresponding object. In this way, the touch input ofselecting the displayed object may be accurately detected.

FIG. 2 is a view showing second position correction with respect to atouch point of the flexible display device in a flat state according toone embodiment of the present specification. Differently from firstposition correction with respect to a touch point based on bending ofthe flexible display device as described above with reference to FIG. 1,second position correction is correction to eliminate an error caused bya difference between a touch point that the eyes of the user recognizeand an actual touch point. Accordingly, even when movement of a positionof the displayed object as mentioned above with regard to the firstposition correction does not occur, the flexible display device mayimplement second position correction.

When the user touches the flexible display device using a finger, adisplayed object may be hidden by the user's finger. Although the usermay look at the top of the finger that touches the object, the bottom ofthe finger touches the object displayed on the flexible display device.Thus, a touch position the user recognizes and an actual touch positioninput to the flexible display device may differ from each other.Therefore, second position correction to correct this difference isnecessary. Although FIG. 2 illustrates left-and-right position variationof touch input by way of example, position correction with respect to atouch point according to the present specification may also be appliedto up-and-down position variation.

In FIG. 2, a user 20 may touch the flexible display device 10. The upperof FIG. 2 and the lower of FIG. 2 are respectively a plan view and aside sectional view showing the flexible display device 10 in a flatstate and user input to the flexible display device 10.

The user 20 may implement first touch input 21 to the flexible displaydevice 10. The first touch input 21 may be input to a first positionwhere the eyes of the user 20 and the flexible display device 10 aresubstantially perpendicular to each other. According to an embodiment,the first position may be set to a position where an angle between theeyes of the user 20 and the flexible display device 10 falls within agiven range on the basis of 90 degrees. The flexible display device 10may detect a user's finger 22 at the first position. Since the eyes ofthe user 20 and the flexible display device 10 are substantiallyperpendicular to each other at the first position, a position the user20 wishes to touch and an actual contact position between the finger 22and the flexible display device 10 may be equal to each other.Accordingly, the flexible display device 10 may determine a positionwhere the first touch input 21 is detected as the first position withoutexecuting position correction with respect to a touch point.

The user 20 may implement second touch input 23 to the flexible displaydevice 10. The second touch input 23 may be input to a second positionwhere the eyes of the user 20 and the flexible display device 10 have afirst angle. The flexible display device 10 may detect a user's finger24 at the second position. Since the eyes of the user 20 and theflexible display device 10 have the first angle at the second position,a position the user 20 wishes to touch and an actual contact positionbetween the finger 24 and the flexible display device 10 may differ fromeach other. As exemplarily shown in FIG. 2, the flexible display device10 may come into contact with the bottom center of the user's finger 24at the second position. However, the user may recognize as if he/shetouches a third position where the eyes of the user 20 who looks at thetop center of the finger 24 and the flexible display device 10 crosseach other. Here, a distance between the second position and the thirdposition may be defined as d1.

In this case, the flexible display device 10 may execute second positioncorrection with respect to a touch point. The flexible display device 10may correct position information, regarding the second touch input 23detected at the second position, from the second position to the thirdposition. In a case in which the second position is in a first directionfrom the first position, the flexible display device 10 may set thethird position to a position moved in the first direction from thesecond position by the distance d1. The flexible display device 10 maydetermine the distance d1 based on a distance between the first positionand the second position. The flexible display device 10 may determinethe distance d1 in proportion to a distance between the first positionand the second position.

The user 20 may implement third touch input 25 to the flexible displaydevice 10. The third touch input 25 may be input to a fourth positionwhere the eyes of the user 20 and the flexible display device 10 have asecond angle. The flexible display device 10 may detect a user's finger26 at the fourth position. Since the eyes of the user 20 and theflexible display device 10 have the second angle at the fourth position,a position the user 20 wishes to touch and an actual contact positionbetween the finger 26 and the flexible display device 10 may differ fromeach other. As exemplarily shown in FIG. 2, the flexible display device10 may come into contact with the bottom center of the user's finger 26at the fourth position. However, the user may recognize as if he/shetouches a fifth position where the eyes of the user 20 who looks at thetop center of the finger 26 and the flexible display device 10 crosseach other. Here, a distance between the fourth position and the fifthposition may be defined as d2.

In this case, the flexible display device 10 may execute second positioncorrection with respect to a touch point. The flexible display device 10may correct position information, regarding the third touch input 25detected at the fourth position, from the fourth position to the fifthposition. In a case in which the fourth position is in a seconddirection from the first position, the flexible display device 10 mayset the fifth position to a position moved in the second direction fromthe fourth position by the distance d2. The flexible display device 10may determine the distance d2 based on a distance between the firstposition and the fourth position. The flexible display device 10 maydetermine the distance d2 in proportion to a distance between the firstposition and the fourth position. As exemplarily shown, a distancebetween the first position and the fourth position is greater than adistance between the first position and the second position, andtherefore d2 may be set to a greater value than d1. That is, theflexible display device 10 may increase a correction distance based onposition information regarding touch input with increasing distancebetween a touch point and the first position where the eyes of the user20 and the flexible display device 10 are substantially perpendicular toeach other.

FIG. 3 is a view showing second position correction with respect to atouch point of the flexible display device in a first bent stateaccording to one embodiment of the present specification. Secondposition correction is correction to eliminate an error caused by adifference between a touch point that the user's eyes recognize and anactual touch point. When the user touches the flexible display deviceusing a finger, a displayed object may be hidden by the user's finger.Although the user may look at the top of the finger that touches theobject, the bottom of the finger touches the object displayed on theflexible display device. Thus, a touch position the user recognizes andan actual touch position input to the flexible display device may differfrom each other. Therefore, second position correction to correct thisdifference is necessary. Although FIG. 3 illustrates left-and-rightposition variation of touch input by way of example, position correctionwith respect to a touch point according to the present specification mayalso be applied to up-and-down position variation.

In FIG. 3, the user 20 may touch the flexible display device 10. Theupper of FIG. 3 and the lower of FIG. 3 are respectively a plan view anda side sectional view, showing the flexible display device 10 in a firstbent state and user input to the flexible display device 10.

The user 20 may implement first touch input 31 to the flexible displaydevice 10. The first touch input 31 may be input to a first positionwhere the eyes of the user 20 and the flexible display device 10 aresubstantially perpendicular to each other. According to an embodiment,the first position may be set to a position where an angle between theeyes of the user 20 and the flexible display device 10 falls within agiven range on the basis of 90 degrees. In addition, the first positionmay be present on a bending axis or within a given distance from thebending axis upon bending of the flexible display device 10.

The flexible display device 10 may detect a user's finger 32 at thefirst position. Since the eyes of the user 20 and the flexible displaydevice 10 are substantially perpendicular to each other at the firstposition, a position the user 20 wishes to touch and an actual contactposition between the finger 32 and the flexible display device 10 may beequal to each other. Accordingly, the flexible display device 10 maydetermine a position where the first touch input 31 is detected as thefirst position without executing position correction with respect to atouch point.

The user 20 may implement second touch input 33 to the flexible displaydevice 10. The second touch input 33 may be input to a second positionwhere the eyes of the user 20 and the flexible display device 10 have afirst angle. The flexible display device 10 may detect a user's finger34 at the second position. Since the eyes of the user 20 and theflexible display device 10 have the first angle at the second positionand the flexible display device 10 is bent, a position the user 20wishes to touch and an actual contact position between the finger 34 andthe flexible display device 10 may differ from each other. Asexemplarily shown in FIG. 3, the flexible display device 10 may comeinto contact with the bottom center of the user's finger 34 at thesecond position. However, the user may recognize as if he/she touches athird position where the eyes of the user 20 who looks at the top centerof the finger 34 and the flexible display device 10 cross each other.Here, a distance between the second position and the third position maybe defined as d3.

Although FIG. 2 shows that the bottom center of the finger comes intocontact with the flexible display device 10, in the case of FIG. 3, theflexible display device 10 is in a bent state and, therefore, a contactposition may not be the bottom center of the finger. That is, in a casein which the second position is in a first direction from a bending axisof the flexible display device 10, a portion of the finger biased in thefirst direction from the bottom center of the finger may come intocontact with the flexible display device 10. Accordingly, d3 in the bentstate may be defined as a less value than d1 in the flat state. That is,the flexible display device 10 may set a correction distance in thefirst bent state to be less than a correction distance in the flat stateupon implementing correction with respect to touch input of touching thesame position on a flexible display unit.

In this case, the flexible display device 10 may execute second positioncorrection with respect to a touch point. The flexible display device 10may correct position information, regarding the second touch input 33detected at the second position, from the second position to the thirdposition. In a case in which the second position is in a first directionfrom the first position, the flexible display device 10 may set thethird position to a position moved in the first direction from thesecond position by the distance d3. The flexible display device 10 maydetermine the distance d3 based on a distance between the first positionand the second position. The flexible display device 10 may determinethe distance d3 in proportion to a distance between the first positionand the second position.

The user 20 may implement third touch input 35 to the flexible displaydevice 10. The third touch input 35 may be input to a fourth positionwhere the eyes of the user 20 and the flexible display device 10 have asecond angle. The flexible display device 10 may detect a user's finger36 at the fourth position. Since the eyes of the user 20 and theflexible display device 10 have the second angle at the fourth positionand the flexible display device 10 is bent, a position the user 20wishes to touch and an actual contact position between the finger 36 andthe flexible display device 10 may differ from each other. Asexemplarily shown in FIG. 3, the flexible display device 10 may comeinto contact with the bottom center of the user's finger 36 at thefourth position. However, the user may recognize as if he/she touches afifth position where the eyes of the user 20 who looks at the top centerof the finger 36 and the flexible display device 10 cross each other.Here, a distance between the fourth position and the fifth position maybe defined as d4.

Although FIG. 2 shows that the bottom center of the finger comes intocontact with the flexible display device 10, in the case of FIG. 3, theflexible display device 10 is in a bent state and, therefore, a contactposition may not be the bottom center of the finger. That is, in a casein which the fourth position is in a second direction from a bendingaxis of the flexible display device 10, a portion of the finger biasedin the second direction from the bottom center of the finger may comeinto contact with the flexible display device 10. Accordingly, d4 in thebent state may be defined as a less value than d2 in the flat state.

In this case, the flexible display device 10 may execute second positioncorrection with respect to a touch point. The flexible display device 10may correct position information, regarding the third touch input 35detected at the fourth position, from the fourth position to the fifthposition. In a case in which the fourth position is in a seconddirection from the first position, the flexible display device 10 mayset the fifth position to a position moved in the second direction fromthe fourth position by the distance d4. The flexible display device 10may determine the distance d4 based on a distance between the firstposition and the fourth position. The flexible display device 10 maydetermine the distance d4 in proportion to a distance between the firstposition and the fourth position. As exemplarily shown, a distancebetween the first position and the fourth position is greater than adistance between the first position and the second position, andtherefore d4 may be set to a greater value than d3. That is, theflexible display device 10 may increase a correction distance based onposition information regarding touch input with increasing distancebetween a touch point and the first position where the eyes of the user20 and the flexible display device 10 are substantially perpendicular toeach other.

FIG. 4 is a view showing second position correction with respect to atouch point of the flexible display device in a second bent stateaccording to one embodiment of the present specification. The secondbent state of the flexible display device may be defined as a state inwhich a bending angle of the flexible display device is greater thanthat in the first bent state. Second position correction is correctionto eliminate an error caused by a difference between a touch point thatthe user's eyes recognize and an actual touch point. When the usertouches the flexible display device using a finger, a displayed objectmay be hidden by the user's finger. Although the user may look at thetop of the finger that touches the object, the bottom of the fingertouches the object displayed on the flexible display device. Thus, atouch position where the user recognizes and an actual touch positioninput to the flexible display device may differ from each other.Therefore, second position correction to correct this difference isnecessary. Although FIG. 4 illustrates left-and-right position variationof touch input by way of example, position correction with respect to atouch point according to the present specification may also be appliedto up-and-down position variation.

In FIG. 4, the user 20 may touch the flexible display device 10. Theupper of FIG. 4 and the lower of FIG. 4 are respectively a plan view anda side sectional view, showing the flexible display device 10 in asecond bent state and user input to the flexible display device 10.

The user 20 may implement first touch input 41 to the flexible displaydevice 10. The first touch input 41 may be input to a first positionwhere the eyes of the user 20 and the flexible display device 10 aresubstantially perpendicular to each other. According to an embodiment,the first position may be set to a position where an angle between theeyes of the user 20 and the flexible display device 10 falls within agiven range on the basis of 90 degrees. In addition, the first positionmay be present on a bending axis or within a given distance from thebending axis upon bending of the flexible display device 10.

The flexible display device 10 may detect a user's finger 42 at thefirst position. Since the eyes of the user 20 and the flexible displaydevice 10 are substantially perpendicular to each other at the firstposition, a position the user 20 wishes to touch and an actual contactposition between the finger 42 and the flexible display device 10 may beequal to each other. Accordingly, the flexible display device 10 maydetermine a position where the first touch input 41 is detected as thefirst position without executing position correction with respect to atouch point.

The user 20 may implement second touch input 43 to the flexible displaydevice 10. The second touch input 43 may be input to a second positionwhere the eyes of the user 20 and the flexible display device 10 have afirst angle. The flexible display device 10 may detect a user's finger44 at the second position. Since the eyes of the user 20 and theflexible display device 10 have the first angle at the second positionand the flexible display device 10 is bent, a position the user 20wishes to touch and an actual contact position between the finger 44 andthe flexible display device 10 may differ from each other. Asexemplarily shown in FIG. 4, the flexible display device 10 may comeinto contact with the bottom center of the user's finger 44 at thesecond position. However, the user may recognize as if he/she touches athird position where the eyes of the user 20 who looks at the top centerof the finger 44 and the flexible display device 10 cross each other.Here, a distance between the second position and the third position maybe defined as d5.

Although FIG. 2 shows that the bottom center of the finger comes intocontact with the flexible display device 10, in the case of FIG. 4, theflexible display device 10 is in a bent state and, therefore, a contactposition may not be the bottom center of the finger. That is, in a casein which the second position is in a first direction from a bending axisof the flexible display device 10, a portion of the finger biased in thefirst direction from the bottom center of the finger may come intocontact with the flexible display device 10. A bending angle of theflexible display device 10 in the second bent state may be greater thanthat in the first bent state. Accordingly, in a case in which the secondposition is in the first direction from a bending axis, the secondposition may be located farther from a position the user 20 wishes totouch in the first direction by a distance d5. Thus, a correctiondirection in the second bent state may be defined as a directionopposite to a correction direction in the flat state and in the firstbent state. That is, assuming that a correction direction in the flatstate and in the first bent state is a first direction, the flexibledisplay device 10 may set a correction direction in the second bentstate to a second direction opposite to the first direction uponimplementing correction with respect to a touch input of touching thesame position on a flexible display unit.

In this case, the flexible display device 10 may execute second positioncorrection with respect to a touch point. The flexible display device 10may correct position information, regarding the second touch input 43detected at the second position, from the second position to the thirdposition. In a case in which the second position is in a first directionfrom the first position, the flexible display device 10 may set thethird position to a position moved in the second direction opposite tothe first direction from the second position by the distance d5. Theflexible display device 10 may determine the distance d5 based on adistance between the first position and the second position. Theflexible display device 10 may determine the distance d5 in proportionto a distance between the first position and the second position.

The user 20 may implement third touch input 45 to the flexible displaydevice 10. The third touch input 45 may be input to a fourth positionwhere the eyes of the user 20 and the flexible display device 10 have asecond angle. The flexible display device 10 may detect a user's finger46 at the fourth position. Since the eyes of the user 20 and theflexible display device 10 have the second angle at the fourth positionand the flexible display device 10 is bent, a position the user 20wishes to touch and an actual contact position between the finger 46 andthe flexible display device 10 may differ from each other. Asexemplarily shown in FIG. 4, the flexible display device 10 may comeinto contact with the bottom center of the user's finger 46 at thefourth position. However, the user may recognize as if he/she touches afifth position where the eyes of the user 20 who looks at the top centerof the finger 46 and the flexible display device 10 cross each other.Here, a distance between the fourth position and the fifth position maybe defined as d6.

Although FIG. 2 shows that the bottom center of the finger comes intocontact with the flexible display device 10, in the case of FIG. 3, theflexible display device 10 is in a bent state and, therefore, a contactposition may not be the bottom center of the finger. That is, in a casein which the fourth position is in a second direction from a bendingaxis of the flexible display device 10, a portion of the finger biasedin the second direction from the bottom center of the finger may comeinto contact with the flexible display device 10. A bending angle of theflexible display device 10 in the second bent state may be greater thanthat in the first bent state. Accordingly, in a case in which the secondposition is in the second direction from a bending axis, the fourthposition may be located farther from a position the user 20 wishes totouch in the second direction by a distance d6. Thus, a correctiondirection in the second bent state may be defined as a directionopposite to a correction direction in the flat state and in the firstbent state. That is, assuming that a correction direction in the flatstate and in the first bent state is a second direction, the flexibledisplay device 10 may set a correction direction in the second bentstate to a first direction opposite to the second direction uponimplementing correction with respect to touch input of touching the sameposition on the flexible display unit.

In this case, the flexible display device 10 may execute second positioncorrection with respect to a touch point. The flexible display device 10may correct position information, regarding the third touch input 45detected at the fourth position, from the fourth position to the fifthposition. In a case in which the fourth position is in a seconddirection from the first position, the flexible display device 10 mayset the fifth position to a position moved in the first direction fromthe fourth position by the distance d6. The flexible display device 10may determine the distance d6 based on a distance between the firstposition and the fourth position. The flexible display device 10 maydetermine the distance d4 in proportion to a distance between the firstposition and the fourth position. As exemplarily shown, a distancebetween the first position and the fourth position is greater than adistance between the first position and the second position, andtherefore d6 may be set to a greater value than d5. That is, theflexible display device 10 may increase a correction distance based onposition information regarding touch input with increasing distancebetween a touch point and the first position where the eyes of the user20 and the flexible display device 10 are substantially perpendicular toeach other.

FIG. 5 is a view showing a method for correcting drag input with respectto the flexible display device according to one embodiment of thepresent specification. The flexible display device 10 may correctposition information regarding drag input. The flexible display device10 may change a correction distance of position information as theposition information regarding drag input is changed by a user dragmotion.

In the upper of FIG. 5, the user 20 may touch a first position of theflexible display device 10 in a bent state using a finger 51. The firstposition may be located in a first direction from a bending axis of theflexible display device 10. The flexible display device 10, as describedabove with reference to FIGS. 3 and 4, may correct position informationregarding the touch input detected at the first position from the firstposition to a second position. Here, a distance between the firstposition and the second position may be defined as d7. A correctiondirection may be changed based on a bent state of the flexible displaydevice 10. In a case in which the flexible display device 10 is in afirst bent state, a correction direction may be the first direction fromthe bending axis toward the first position. In a state in which theflexible display device 10 is in a second bent state, a correctiondirection may be a second direction opposite to the first direction.

The flexible display device 10 may detect drag input by the finger 51detected at the first position. The finger 51 detected at the firstposition may be continuously dragged to a position on the bending axisof the flexible display device 10. The flexible display device 10 maynot implement position correction, as described above with reference toFIGS. 3 and 4, with respect to the position on the bending axis where auser's finger 52 touches. That is, assuming that the position on thebending axis is a third position, the flexible display device 10 may setposition information regarding drag input to the third position withoutcorrection of a touch position with respect to the drag input detectedat the third position. Accordingly, a position correction distance onthe basis of the bending axis may be zero. The flexible display device10 may stepwise or continuously reduce the correction distance withrespect to the touch position from d7 to zero while the touch inputdetected at the first position is dragged to the third position.Thereby, the flexible display device 10 may implement accurate touchposition correction with respect to the continuously moving drag input.

In the lower of FIG. 5, the user 20 may touch a fourth position of theflexible display device 10 in a bent state using a finger 53. The fourthposition may be located on the bending axis of the flexible displaydevice 10. The flexible display device 10, as described above withreference to FIGS. 3 and 4, may directly determine and use positioninformation regarding the touch input detected at the fourth positionwithout correction. Accordingly, a position correction distance on thebasis of the bending axis may be zero.

The flexible display device 10 may detect drag input by the finger 53detected at the fourth position. The finger 53 detected at the fourthposition may be continuously dragged to a fifth position of the flexibledisplay device 10. The flexible display device 10 may implement positioncorrection, as described above with reference to FIGS. 3 and 4, withrespect to a user's finger 54 on the fifth position. The flexibledisplay device 10 may correct position information regarding the draginput detected at the fifth position from the fifth position to a sixthposition. Here, a distance between the fifth position and the sixthposition may be defined as d8. A correction direction may be changedbased on a bent state of the flexible display device 10. In a case inwhich the flexible display device 10 is in a first bent state, acorrection direction may be a first direction from the bending axis tothe fifth position. In a case in which the flexible display device 10 isin a second bent state, a correction direction may be a second directionopposite to the first direction.

The flexible display device 10 may stepwise or continuously increase thecorrection distance with respect to the touch position from zero to d8while the touch input detected at the fourth position is dragged to thefifth position. Thereby, the flexible display device 10 may implementaccurate touch position correction with respect to the continuouslymoving drag input.

FIG. 6 is a view showing a method for determining a bent state of theflexible display device according to one embodiment of the presentspecification. The flexible display device 10 may determine a first bentstate or a second bent state based on an angle between the eyes of theuser and the flexible display device 10.

The flexible display device 10 may be set to a first bent state when abending angle is below a threshold angle, and may be set to a secondbent state when a bending angle exceeds the threshold angle. Here, thethreshold angle may be a bending angle of the flexible display device 10in a case in which an angle between the eyes of the user who looks at aposition where touch input occurs and the flexible display device 10 iswithin a first angle range including a right angle. In FIG. 6, when theflexible display device 10 detects touch input at a first position P1,an angle between the eyes of the user and the flexible display device 10may be a right angle at the first position P1. In addition, since theflexible display device 10 is bendable, an angle between the eyes of theuser and the flexible display device 10 at a second position P2 may be aright angle when touch input occurs at the second position P2 in a bentstate of the flexible display device 10. Likewise, when touch inputoccurs at a third position P3 in a bent state of the flexible displaydevice 10, an angle between the eyes of the user and the flexibledisplay device 10 at the third position P3 may be a right angle.Accordingly, when the user's touch input occurs at the second positionP2 or the third position P3, a bending angle of the flexible displaydevice 10 in FIG. 6 may be the threshold angle. As described above, in acase in which the bending angle is equal to the threshold angle, theflexible display device 10 may not implement correction of positioninformation regarding the touch input detected at the second position P2or the third position P3.

The flexible display device 10 may be set to a first bent state when abending angle thereof is below the threshold angle. When the flexibledisplay device 10 is set to the first bent state, the flexible displaydevice 10 may reduce a correction distance of the position informationregarding the touch input as the bending angle is increased.

In a case in which the bending angle exceeds the threshold angle, theflexible display device 10 may be set to a second bent state. When theflexible display device 10 is set to the second bent state, the flexibledisplay device 10 may increase a correction distance of the positioninformation regarding the touch input as the bending angle is increased.

That is, the flexible display device 10 may be set to the first bentstate when undergoing bending in a flat state thereof, and may be set tothe second bent state when the bending angle thereof in the first bentstate exceeds the threshold angle. Likewise, the flexible display device10 may be set to the first bent state when the bending angle thereof inthe second bent state is reduced below the threshold angle, and may beset to a flat state when the bending angle thereof in the first bentstate is close to zero.

FIG. 7 is a view showing state setting on a per region basis of theflexible display device according to one embodiment of the presentspecification. In a case in which bending of the flexible display device10 occurs, a state of the flexible display device 10 may be set on a perregion basis. For example, as exemplarily shown in FIG. 7, the flexibledisplay device 10 may classify touch sensitive regions into three kindsof regions.

The bent flexible display device 10 may set a first region 71 includinga bending axis to a flat state. Thus, the flexible display device 10 mayimplement touch position correction in the first region 71 that is in aflat state as described above with reference to FIG. 2. The bentflexible display device 10 may set second regions 72 proximate to bothsides of the first region 71 to a first bent state. Thus, the flexibledisplay device 10 may implement touch position correction in the secondregions 72 that are in the first bent state as described above withreference to FIG. 3. The bent flexible display device 10 may set thirdregions 73 located at edges thereof to a second bent state. Thus, theflexible display device 10 may implement touch position correction inthe third regions 73 that are in the second bent state as describedabove with reference to FIG. 4.

A boundary between the first and second regions 71 and 72 and a boundarybetween the second and third regions 72 and 73 may be changed based onthe bending angle of the flexible display device 10 or the bending angleof each region.

In addition, according to an embodiment, the flexible display device 10may set touch sensitive regions to two kinds of regions. Although notshown, the flexible display device 10 may set a first region including abending axis thereof to a flat state, and the other regions proximate tothe first region to a first bent state or a second bent state. Inaddition, the flexible display device 10 may set the first regionincluding the bending axis to the first bent state and the other regionsproximate to the first region to the second bent state.

The flexible display device 10 may implement accurate positioncorrection with respect to touch input on a per region basis by applyingdifferent correction distances and different correction directions ofposition information regarding the touch input on a per region basis.

FIG. 8 is a block diagram of the flexible display device according toone embodiment of the present specification. The flexible display devicemay include a display unit 101, a touch sensor unit 102, a bendingsensor unit 103, and a controller 104. In addition, according to anembodiment, as an optional component, the flexible display device mayfurther include a gaze detecting unit configured to detect the eyes ofthe user.

The display unit 101 may display a virtual reality image. A Head MountedDisplay (HMD) may track movement of the user's head, and the displayunit 101 may change a region of the virtual reality image to bedisplayed based on movement of the user's head. In this way, the usermay view a virtual reality image allotted in each direction even if theuser views a front direction, a lateral direction, or a rear direction.As a result, the user may feel as if the user is in a virtual spacecreated by the virtual reality image.

The display unit 101 may display an image including visual information.The display unit 101 may include a flexible display unit, a foldabledisplay unit, a rollable display unit, or a bendable display unit. Thedisplay unit 101, as described above with reference to FIG. 1, maycorrect a displayed image based on bending of the flexible displaydevice, and display the corrected image. In addition, the display unit101 may display an image or object corresponding to touch input whoseposition information is corrected.

The touch sensor unit 102 may sense touch input to the flexible displaydevice. As described above, the touch sensor unit 102 may sense touchinput, and transmit position information regarding the touch input tothe controller 104. As described above with reference to FIGS. 2 to 4,position information regarding the sensed touch input may differ from aposition the user wishes to touch, and the controller 104 may changeposition information regarding the sensed touch input to a position theuser wishes to touch via correction of the position information. Thetouch sensor unit 102 may include a pressure sensitive or capacitivetouch sensor.

The bending sensor unit 103 may sense a bending angle of the flexibledisplay device, and transmit the sensed bending angle to the controller104. The bending sensor unit 103 may sense the bending angle of theflexible display device when the flexible display device is bent about asingle bending axis. In addition, the bending sensor unit 103 may sensea bending angle per each region included in the flexible display devicewhen the flexible display device is bent about a plurality of bendingaxes. The bending sensor unit 103 may transmit the sensed bending angleto the controller 104. The bending angle sensed by the bending sensorunit 103 may be a factor in determining the state of the flexibledisplay device. The flexible display device may be set to at least onestate among the flat state, the first bent state, and the second bentstate based on the bending angle thereof. As described above withreference to FIG. 7, the state of a single flexible display device maybe differently set on a per region basis.

The controller 104 may correct position information regarding touchinput based on the sensed results transmitted from the touch sensor unit102 and the bending sensor unit 103. As described above with referenceto FIGS. 2 to 4, the controller 104 may implement different touchposition corrections with respect to touch input detected at the samefirst position based on the bending angle. In a case in which theflexible display unit is in a flat state, the controller 104 may correctposition information regarding the touch input detected at the firstposition of the flexible display unit from the first position to asecond position. In addition, in a case in which the flexible displayunit is in a first bent state, the controller 104 may correct positioninformation regarding the touch input detected at the first position ofthe flexible display unit from the first position to a third position.Here, a distance between the first position and the third position maybe less than a distance between the first position and the secondposition. In addition, in a case in which the flexible display unit isin a second bent state, the controller 104 may correct positioninformation regarding the touch input detected at the first position ofthe flexible display unit from the first position to a fourth position.Here, the second bent state may be defined as a state in which a bendingangle of the flexible display unit is greater than that in the firstbent state on the basis of the same bending axis. In addition, withregard to correction of position information regarding touch input, thesecond position and the third position may be located in a firstdirection from the first position, and the fourth position may belocated in a second direction from the first position. Here, the firstdirection is a given direction from the bending axis of the flexibledisplay unit to the first position, and the second direction is adirection opposite to the first direction from the first position to thebending axis. That is, the controller 104 may set the first and seconddirections to opposite directions.

FIG. 8 is a block diagram in accordance with one embodiment. In FIG. 8,separately shown blocks represent logically separated elements of theflexible display device. Thus, the elements of the flexible displaydevice as described above may be mounted as one chip or a plurality ofchips according to design of the flexible display device.

FIG. 9 is a flowchart showing operation of the flexible display deviceaccording to one embodiment of the present specification. The flexibledisplay device may detect touch input at a first position of theflexible display unit (S10). The flexible display device may detect thetouch input at the first position using the touch sensor unit. The firstposition may be defined as a position the user actually touches. Theflexible display device may judge whether or not the first positionwhere touch input is detected coincides with an accurate position theuser wishes to touch based on a state of the flexible display unit asdescribed below.

The flexible display device may detect a state of the flexible displayunit (S20). The flexible display device may detect the state of theflexible display unit using the bending sensor unit. The state of theflexible display unit may include a flat state and a bent state. Inaddition, the bent state may include a first bent state and a secondbent state. The flexible display unit may include one or more bendingaxes. Under the presence of the plurality of bending axes, as describedabove with reference to FIG. 7, the state of the flexible display unitmay be set on a per region basis.

The flexible display device may determine whether the flexible displayunit is in the flat state or in the first bent state (S30). Thecontroller of the flexible display device may determine whether theflexible display unit is in the flat state or in the first bent statebased on the sensed results transmitted from the bending sensor unit.Although not shown, the flexible display device may additionallydetermine whether the flexible display unit is in the second bent state.The flexible display device may determine a correction direction basedon the state of the flexible display unit, and determine a correctiondistance based on a distance between the first position and the bendingaxis.

In a case in which the flexible display unit is in the flat state, theflexible display device may correct position information regarding thedetected touch input from the first position to a second position (S40).As described above with reference to FIG. 2, the flexible display devicemay correct position information regarding the touch input from thefirst position to the second position located in a first direction. Thefirst direction may be defined as a direction toward the first positionfrom the bending axis of the flexible display unit. In addition, theflexible display device may correct position information regarding touchinput from the first position to the second position, the secondposition being spaced apart from the first position by a first distancein the first direction. The flexible display device may set the firstdistance in proportion to a distance from the bending axis to the firstposition.

In a case in which the flexible display unit is in the first bent state,the flexible display device may correct position information regardingthe detected touch input from the first position to a third position(S50). As described above with reference to FIG. 3, the flexible displaydevice may correct position information regarding the touch input fromthe first position to the third position located in the first direction.The first direction may be defined as a direction toward the firstposition from the bending axis of the flexible display unit. Inaddition, the flexible display device may correct position informationregarding the touch input from the first position to the third position,the third position being spaced apart from the first position by asecond distance in the first direction. The flexible display device mayset the second distance in proportion to a distance from the bendingaxis to the first position. In addition, the flexible display device mayset the second distance to a less value than the first distance. Theflexible display device may increase a difference between the firstdistance and the second distance as the bending angle in the first bentstate is increased. That is, the flexible display device may reduce thesecond distance as the bending angle in the first bent state isincreased.

Although not shown, in a case in which the flexible display unit is inthe second bent state, the flexible display device may correct positioninformation regarding the touch input from the first position to afourth position. The flexible display device may set a position locatedin a second direction from the first position to the fourth position.Here, the second direction may be set to a direction opposite to thefirst direction that is a correction direction of the second positionand the third position.

As described above with reference to FIG. 4, the flexible display devicemay correct position information regarding touch input from the firstposition to a fourth position located in the second direction. Thesecond direction may be defined as a direction from the first positiontoward the bending axis of the flexible display unit. In addition, theflexible display device may correct position information regarding touchinput from the first position to a fourth position that is spaced apartfrom the first position in the second direction by a third distance. Theflexible display device may set the third distance in proportion to adistance from the bending axis to the first position. The flexibledisplay device may increase the third distance as the bending angle inthe second bent state is increased.

The flexible display device may control the flexible display unit basedon the corrected position information (S60). The flexible display devicemay implement a control instruction based on the position informationregarding touch input corrected based on each state of the flexibledisplay unit. For example, the flexible display device may control animage or object displayed at a position corresponding to the correctedposition information. In addition, the flexible display device mayexecute an application displayed at a position corresponding to thecorrected position information. The flexible display device is notcontrolled based on a position where touch input is actually detected,but based on a position corresponding to the corrected positioninformation regarding touch input.

As described above, the flexible display device may implement touchsensing that accurately reflects the will of the user by correctingposition information regarding touch input using different correctiondirections and correction distances based on a state of the flexibledisplay unit. In this way, the flexible display device may reduce touchsensing errors.

As is apparent from the above description, according to the presentspecification, a flexible display device may differently correct aposition where touch input is detected based on whether the flexibledisplay device is in a flat state or in a bent state.

In addition, according to the present specification, the flexibledisplay device may divide a bent state thereof into a first bent stateand a second bent state, such that the position where touch input isdetected is differently corrected based on whether the flexible displaydevice is in the first bent state or in the second bent state.

In addition, according to the present specification, the flexibledisplay device may differently set a correction direction of theposition where touch input is detected based on a bending angle thereof.

In addition, according to the present specification, the flexibledisplay device may accurately detect a position a user wishes to touchvia position correction regarding touch input.

In addition, according to the present specification, the flexibledisplay device may set a state thereof on a per touch region basis, andcorrect position information regarding touch input on a per touch regionbasis.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present specificationwithout departing from the spirit or scope of the specification. Thus,it is intended that the present specification covers the modificationsand variations of this specification provided they come within the scopeof the appended claims and their equivalents.

FIG. 10 is a block diagram of the flexible display device according toone embodiment of the present specification. The flexible display devicemay include a display unit 101, a touch sensor unit 102, a bendingsensor unit 103, a controller 104 and a memory 105.

Referring to FIG. 10, in this block diagram, the detailed description onparts that are similar to or that overlap with the detailed descriptionprovided above with reference to FIG. 8 will be omitted.

The memory 105 stores first position information of the first touchinput that is offset a first predetermined amount from the firstposition based on the command from the controller 104.

The memory 105 stores second position information of the second touchinput that is offset a second predetermined amount from the firstposition, wherein the first predetermined amount of offset is greaterthan the second predetermined amount of offset.

The memory 105 stores third position information of the third touchinput that is offset a third predetermined amount from the firstposition.

Wherein the second bent state is a state in which a bending angle of theflexible display unit is greater than that in the first bent state basedon an identical bending axis, wherein the first and second positioninformation are offset in a direction from the first position away froma bending axis of the flexible display device, wherein the thirdposition information is offset in a direction from the first positiontoward the bending axis,

wherein the flexible display unit is set to the first bent state whenthe bending angle is below a threshold angle, wherein the flexibledisplay unit is set to the second bent state when the bending angleexceeds the threshold angle.

The controller 104 is further configured to store position informationof the second touch input that is not offset the second predeterminedamount from the first position, when a bending angle at the firstposition is less than a threshold angle.

Wherein the threshold angle is the bending angle of the flexible displayunit when an angle between eyes of a user looking at the first positionand the flexible display unit is substantially a right angle,

The first and second predetermined amount of offsets increase as thefirst position is farther away from where eyes of a user looking at thefirst position and the flexible display unit are substantiallyperpendicular to each other.

FIG. 11 is a flowchart showing operation of the flexible display deviceaccording to one embodiment of the present specification. The presentinvention is performed by the controller 104.

The controller 104, receives a first touch input at a first position onthe flexible display unit in a flat state (S1110).

The controller 104, stores in the memory 105, first position informationof the first touch input that is offset a first predetermined amountfrom the first position (S1120).

The controller 104, receives, a second touch input at the first positionon the flexible display unit in a first bent state (S1130).

The controller 104, stores, in the memory 105, second positioninformation of the second touch input that is offset a secondpredetermined amount from the first position, wherein the firstpredetermined amount of offset is greater than the second predeterminedamount of offset (S1140).

The controller 104, receives a third touch input at the first positionon the flexible display unit in a second bent state (S1150).

The controller 104, stores, in the memory 105, third positioninformation of the third touch input that is offset a thirdpredetermined amount from the first position, wherein the second bentstate is a state in which a bending angle of the flexible display unitis greater than that in the first bent state based on an identicalbending axis, wherein the first and second position information areoffset in a direction from the first position away from a bending axisof the flexible display device, wherein the third position informationis offset in a direction from the first position toward the bendingaxis, wherein the flexible display unit is set to the first bent statewhen the bending angle is below a threshold angle.

The flexible display unit is set to the second bent state when thebending angle exceeds the threshold angle. The controller 104 is furtherconfigured to store position information of the second touch input thatis not offset the second predetermined amount from the first position,when a bending angle at the first position is less than a thresholdangle, wherein the threshold angle is the bending angle of the flexibledisplay unit when an angle between eyes of a user looking at the firstposition and the flexible display unit is substantially a right angle,wherein the first and second predetermined amount of offsets increase asthe first position is farther away from where eyes of a user looking atthe first position and the flexible display unit are substantiallyperpendicular to each other (S1160).

What is claimed is:
 1. A flexible display device comprising: a flexibledisplay unit; and a controller configured to: receive a first touchinput at a first position on the flexible display unit in a flat state,store, in a memory, first position information of the first touch inputthat is offset a first predetermined amount from the first position,receive a second touch input at the first position on the flexibledisplay unit in a first bent state, and store, in the memory, secondposition information of the second touch input that is offset a secondpredetermined amount from the first position, wherein the firstpredetermined amount of offset is greater than the second predeterminedamount of offset.
 2. The device according to claim 1, wherein thecontroller is further configured to: receive a third touch input at thefirst position on the flexible display unit in a second bent state, andstore, in the memory, third position information of the third touchinput that is offset a third predetermined amount from the firstposition.
 3. The device according to claim 2, wherein the second bentstate is a state in which a bending angle of the flexible display unitis greater than that in the first bent state based on an identicalbending axis.
 4. The device according to claim 2, wherein the first andsecond position information are offset in a direction from the firstposition away from a bending axis of the flexible display device.
 5. Thedevice according to claim 4, wherein the third position information isoffset in a direction from the first position toward the bending axis.6. The device according to claim 2, wherein the flexible display unit isset to the first bent state when the bending angle is below a thresholdangle, and wherein the flexible display unit is set to the second bentstate when the bending angle exceeds the threshold angle.
 7. The deviceaccording to claim 1, wherein the controller is further configured tostore position information of the second touch input that is not offsetthe second predetermined amount from the first position, when a bendingangle at the first position is less than a threshold angle.
 8. Thedevice according to claim 7, wherein the threshold angle is the bendingangle of the flexible display unit when an angle between eyes of a userlooking at the first position and the flexible display unit issubstantially a right angle.
 9. The device according to claim 1, whereinthe first and second predetermined amount of offsets increase as thefirst position is farther away from where eyes of a user looking at thefirst position and the flexible display unit are substantiallyperpendicular to each other.
 10. The device according to claim 1,wherein the controller is further configured to apply the touch input toan object displayed at a position corresponding to the stored first orsecond position information of the touch input.
 11. The device accordingto claim 1, wherein the offset of the second position information isreduced when the touch input in contact with the flexible display unitis dragged from the first position toward a bending axis of the flexibledisplay device.
 12. A method of controlling a flexible display device,the method comprising: receiving, via a controller of the flexibledisplay device, a first touch input at a first position on the flexibledisplay unit in a flat state; storing, in a memory, first positioninformation of the first touch input that is offset a firstpredetermined amount from the first position; receiving, via thecontroller, a second touch input at the first position on the flexibledisplay unit in a first bent state; and storing, in the memory, secondposition information of the second touch input that is offset a secondpredetermined amount from the first position, wherein the firstpredetermined amount of offset is greater than the second predeterminedamount of offset.
 13. The method according to claim 12, furthercomprising: receiving a third touch input at the first position on theflexible display unit in a second bent state; and storing, in thememory, third position information of the third touch input that isoffset a third predetermined amount from the first position.
 14. Themethod according to claim 13, wherein the second bent state is a statein which a bending angle of the flexible display unit is greater thanthat in the first bent state based on an identical bending axis.
 15. Themethod according to claim 13, wherein the first and second positioninformation are offset in a direction from the first position away froma bending axis of the flexible display device.
 16. The method accordingto claim 15, wherein the third position information is offset in adirection from the first position toward the bending axis.
 17. Themethod according to claim 13, wherein the flexible display unit is setto the first bent state when the bending angle is below a thresholdangle, and wherein the flexible display unit is set to the second bentstate when the bending angle exceeds the threshold angle.
 18. The methodaccording to claim 12, wherein the controller is further configured tostore position information of the second touch input that is not offsetthe second predetermined amount from the first position, when a bendingangle at the first position is less than a threshold angle.
 19. Themethod according to claim 18, wherein the threshold angle is the bendingangle of the flexible display unit when an angle between eyes of a userlooking at the first position and the flexible display unit issubstantially a right angle.
 20. The method according to claim 12,wherein the first and second predetermined amount of offsets increase asthe first position is farther away from where eyes of a user looking atthe first position and the flexible display unit are substantiallyperpendicular to each other.